4-Methoxy-2H-pyrido[4,3-b]-1,4-oxazin-3(4H)-one 、 7β-amino-3'-desacetoxy-3'-iodocephalosporanic acid 、
trimethylsilyl 2,2,2-trifluoro-N-(trimethylsilyl)acetimidate 生成 trimethylsilyl (6R,7R)-3-[(4-methoxy-3-oxopyrido[4,3-b][1,4]oxazin-6-ium-6-yl)methyl]-8-oxo-7-(trimethylsilylamino)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate;iodide